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with regions of reduced Fluorescence. By Prof. Dr. J. A. Nakhosteen Augusta-Kranken-Anstalt Bochum. In keeping with the 20-year-old tradition of up-dating the Nakhosteen Broncho Boy Bronchoscopy Teaching Model the latest innovation is the auto-fluorescing endoscopic systems for use with the Light Imaging Fluorescence Endoscope (LIFE Æ Xillix/Olympus) or SAFE (1000 Pentax). The bronchial mucosa appears normal with conventional (white light) bronchoscopy but on being illuminated in the fluorescent mode emits a green image idential to that of normal mucosa. The trachea and left-sided bronchial branches appear normal in the fluorescence mode but distinct areas of reduced fluorescence can be observed on the right-sided bronchial tree (upper lobe spur middle lobe spur right main bronchus and RB 9/10 spur). Endoscopists using to the LIFE-System or SAFE 1000 for the first time can practice switching from white light to fluorescent mode and in the latter mode learn (light intensity) adjustment in addition to recognizing areas of reduced fluorescence. The Fluorescent Tracheo-Bronchial Tree can be added to each CLA Broncho Boy with the order numbers TS 9 to TS 9/7 or can be supplied additionally as the interchangeable lower part of the tracheo-bronchial tree.